Crankshaft mounting for internal combustion engines



Sept. 6, 1932 c. L. WALKER 1,875,682

CRANKSHAFT MOUNTING FOR INTERNAL CO LQBUSTION ENGINES Original Filed Aug. 26. i929 INVENT OR.

W95 Wzlu.

Z WYW ATTORNEYS.

crankshaft mounting therefor and has forits' ctmron L. WALKER,

Patented Sept. 6, 1932 i T TAT Z A T or. rinnmon'r, currofnnrai assionon orient-marine" 3 100128 H ALKER, or PIEDMONT, oALIronNIa j j e? ewsswam; v -5 Original application meaau ust 26,1929, Serial 110. 388,574. Divided and this s plimioi'aaiea'n s'i,

l i 1980. Ser1a1'1wo. 8,37-f

This application is a divisionlof my cos pending application entitled Internal "comustion engine, filed August- 26, 1929, and bearing Serial Number 388,574. r

The invention relates to internal combustion engines and particularly pertains to a.

- principal object the provision of a crankshaft tween" these hearings and the" a 0f the crankshaft so as to compensate'for the difference in expansion between the crank mounting for internal combustion engines which will compensatefor any misalignment of the crankshaft and compensate for the difference in expansion between the crankshaft and the crank case."

' In carrying the invention into practice, the crank case of the'cngine is provided with selfaligning bearings; Clearance is (provided beacent webs case and the crankshaftQ One form whichthe invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawing, in which:

The figureis a view in'ele'vation and sec "tion of a crankshaft with the connected reciprocating parts disclosing the construction thereof. i

Referring more particularly to the accompanying drawing, 10 indicates a crankshaft having'cylindrical bearing portions 1l at its opposite ends. These bearingportlons 11 extend through bushings 12having spherical portions 14 journaled in spherical bearings 15. This construction enables the bushings 12 to be self-centering so that they will always remain in proper alignment with the bearing ends 11 of the crankshaft.

It is desired to point out that there is clearance at both ends of the crankshaft between the end webs or throws 16 and the.

bushings 12 so as to compensate for the difference in expansion between the crank case and the crankshaft;

The crankshaft disclosed in the present 1 20 formed in the ends of adjacent throws16.

The fit between the pins 19 and QQwisia shrink fit and'I reinforce the.bondbetweenjtheis indles 19 and the crank'throws 163by-wel ing a joint between'the spindles andftheth-nows around the periphery: of the: spindlesfat the pointindicated in, the drawing. Connected with the crank pins l'larez conof the rods 18, eachrod is formed with a sphericals wrist the piston 23 ,The'wristpin l'xearing of the connecting rods 18a'is not split," so, m order 1 to form the bushing 20a therein, 1 the latter is'cast directly into; the wrist intbearingl.

To accomplish this, I castt eibushing inl I Y the wrist pinbearing ofthe rod usin metallic molds to form the outer ends of t ebush ing and cone-shaped 'coresto form, theopenafter it is castleaves'italvery loosefit in the insert cone-shaped punches in Jthe coneshaped socketsin opposite'ends-of the bushing and expand the bushing byswedging at meeting rods18a, each of which is" formediv with: a spherical split rbearing .19a-.1em-

bracing the spherical portiona181 "of the proper crank, upin; Atthe wrist up ping end in? bearing; having a it bushing 200 which as a s herical; portion I turnable in .the bearing -19 .The bushing y adjacent ends of the wrist pini'b'osses22uon;

wrist pin bearing 19?). -To o vercome this, I

each end thereof IuntilI efiect a; proper fit between the bushing and the-wrist pin bearing19b. The opening through the bushing 20a to receive the wrist pin vis then reamed so that it will be a proper fit with the pin 21.

By the use of this clearance need be providedbetweenthe ends siderable advanta e because, itprevents v ibration between t e ends of the wrist pm type of constructiomno f of the bushing 20a and the endsof thewrist, 'pin bosses 22 onlthe piston. This-sis: a conshaft will converge thelubricant in the. greatest diameter of the spherical bearing and. thus preventthelubricant being thrown and therefore" any errors occurring in alignment during the construction and assembling of the engine will be. automatically compen-' sated for. Likewise, I 'find'that the bear- Y of. my invention,it is to be understood that ings will. be 1. more properly lubricated with tlns construction due to the fact that centrifugal force during the operation of the crankorsqueezed out'of the sides of the bearing. In practice, the crank throws 16 and the crank pins 17 are made in separate parts by ,drop forging. The crank pins 17 are hardenedand'then ground to spherical form. The crank throws'and the crank pins are then assembled by shrinking the spindles 19'into .the

drilled openings in theend of the throws.

weld is thenefl'ected at the. ends of the spin-g dles-19between-their periphery and the adj acentsurfaceof the crank throws. This forms a tight and rigid connection between the crank directly into the wrist pin bearing and it is thereafter expanded'to' a proper fit. When this has been done, the bushing 20a is proper- 'ly reamed to receive the wrist pin 21. The

-"'pinsand the throws. i 1

t pin bearing bushing in "To form the wrls each connecting rod, the bushing 20a is cast "'leng'thof the bushing is such that noclearv pin ance is provided between its ends and the ends of the piston bosses. The piston is assembled on the connecting rod by arranging the wrist bearing and bushing in proper alignment with the piston bosses 22 and thereafter inme'thod of forming the wrist pin bearing 7 bushing is described and claimed in my oopending application entitled Wrist pin bear 1 ing, filed May 31, 1930-, Ser. No. 458,366.

-To assemble the connecting rods on the spherical portions 18 of the crank pins'17, the 1 connecting rod bearings are made in halves which are assembled to embrace the sphericalportion'18 ofthe crank pin 17;

-During the operation of the engine, any,

I desire to point out-that the bushing 14 at the'ends of the crankshaft are Self aligning and that the main bearing at the center of the I crankshaft is of the same construction as the connecting rod bearings.

- misalignment due to faulty construction or assembly will be automatically compensated for "by the universal movement permitted between the connecting rods and the crank pins and pins. This will eliminate any chattering of the wrist pin bearing in the piston and other some misa This improved bearing constructions so that a built up crankshaft may be utilized and which w1ll I enable the reciprocating parts to automatically"assurne properalignment in the event that ignment has been permitted dur in the construction and assembly of the parts.

TVhile I have'shown the preferred form various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having, thus described my invention, what I claim and desire to secure by LettersPatent .is: 1 V.

anengine having a crankcase with I 1. In end main bearings and an intermediate'main bearing, a fixed s heri'cal bushing inthe intermediate main caring, a crankshaft having a spherical portion mountedin the fixedspherical bushing in the intermediate main bear ng, bushings mounted in thelend main bearings for universal movement, said crankshaft having portions mounted in said bushings for rotative and axialmovement. 2. In an internal combustlon englne havmg a crankcase and crankshaft. with cranks intermediate its ends, said crankcase formed with end main bearings, an intermediate main bearing located centrally between the end mam earings, a'spherical bushing in said intermediate main bearing, said crankshaft having a spherical ortion ]ournalled in said spherical bushing, ushings mounted. in the end main bearings for, universal movement,

the end portions of said crankshaft being rotatably and reciprocably mounted in said main bearin bushing to compensate for lonbushings.

- CLINTON L. :WALKER.

' between the connecting rods and the wrist 

